#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<assert.h>
int my_strlen( const char* arr)
{
	assert(arr);
	int cnt = 0;
	while (*arr)
	{
		cnt++;
		arr++;
	}
	return cnt;

}
int main()
{
	char arr[] = "arrrrrrrrrrrrr";
	int ret = my_strlen(arr);
	printf("%d", ret);
	return 0;
}